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GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangible Assets Subject to Amortization (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 25,555.9 $ 24,438.2
Accumulated Amortization (10,813.5) (9,963.9)
Net Book Value 14,742.4 14,474.3
Acquired network location intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 5,559.8 5,365.4
Accumulated Amortization (2,796.6) (2,659.8)
Net Book Value $ 2,763.2 2,705.6
Acquired network location intangibles | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Lives (years) 30 years  
Acquired tenant-related intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 18,615.3 17,666.0
Accumulated Amortization (7,460.2) (6,823.7)
Net Book Value $ 11,155.1 10,842.3
Acquired tenant-related intangibles | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Lives (years) 30 years  
Acquired licenses and other intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 1,380.8 1,406.8
Accumulated Amortization (556.7) (480.4)
Net Book Value $ 824.1 $ 926.4
Acquired licenses and other intangibles | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Lives (years) 2 years  
Acquired licenses and other intangibles | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Lives (years) 30 years